Commit | Line | Data |
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1f067167 YL |
1 | #include <linux/kernel.h> |
2 | #include <linux/errno.h> | |
3 | #include <linux/string.h> | |
4 | #include <linux/types.h> | |
5 | #include <linux/mm.h> | |
6 | #include <linux/smp.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/pfn.h> | |
9 | ||
10 | #include <asm/e820.h> | |
11 | ||
6d74171b AH |
12 | static u64 patterns[] __initdata = { |
13 | 0, | |
14 | 0xffffffffffffffffULL, | |
15 | 0x5555555555555555ULL, | |
16 | 0xaaaaaaaaaaaaaaaaULL, | |
63823126 AH |
17 | 0x1111111111111111ULL, |
18 | 0x2222222222222222ULL, | |
19 | 0x4444444444444444ULL, | |
20 | 0x8888888888888888ULL, | |
21 | 0x3333333333333333ULL, | |
22 | 0x6666666666666666ULL, | |
23 | 0x9999999999999999ULL, | |
24 | 0xccccccccccccccccULL, | |
25 | 0x7777777777777777ULL, | |
26 | 0xbbbbbbbbbbbbbbbbULL, | |
27 | 0xddddddddddddddddULL, | |
28 | 0xeeeeeeeeeeeeeeeeULL, | |
29 | 0x7a6c7258554e494cULL, /* yeah ;-) */ | |
6d74171b | 30 | }; |
40823f73 | 31 | |
570c9e69 | 32 | static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad) |
7dad169e | 33 | { |
570c9e69 AH |
34 | printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n", |
35 | (unsigned long long) pattern, | |
36 | (unsigned long long) start_bad, | |
37 | (unsigned long long) end_bad); | |
7dad169e AH |
38 | reserve_early(start_bad, end_bad, "BAD RAM"); |
39 | } | |
40 | ||
570c9e69 | 41 | static void __init memtest(u64 pattern, u64 start_phys, u64 size) |
1f067167 | 42 | { |
c9690998 AH |
43 | u64 *p; |
44 | void *start, *end; | |
570c9e69 AH |
45 | u64 start_bad, last_bad; |
46 | u64 start_phys_aligned; | |
47 | size_t incr; | |
1f067167 | 48 | |
6d74171b | 49 | incr = sizeof(pattern); |
1f067167 | 50 | start_phys_aligned = ALIGN(start_phys, incr); |
1f067167 | 51 | start = __va(start_phys_aligned); |
c9690998 | 52 | end = start + size - (start_phys_aligned - start_phys); |
1f067167 YL |
53 | start_bad = 0; |
54 | last_bad = 0; | |
55 | ||
c9690998 AH |
56 | for (p = start; p < end; p++) |
57 | *p = pattern; | |
58 | for (p = start; p < end; p++, start_phys_aligned += incr) { | |
59 | if (*p == pattern) | |
7dad169e AH |
60 | continue; |
61 | if (start_phys_aligned == last_bad + incr) { | |
62 | last_bad += incr; | |
63 | continue; | |
1f067167 | 64 | } |
7dad169e AH |
65 | if (start_bad) |
66 | reserve_bad_mem(pattern, start_bad, last_bad + incr); | |
67 | start_bad = last_bad = start_phys_aligned; | |
1f067167 | 68 | } |
7dad169e AH |
69 | if (start_bad) |
70 | reserve_bad_mem(pattern, start_bad, last_bad + incr); | |
1f067167 YL |
71 | } |
72 | ||
bfb4dc0d AH |
73 | static void __init do_one_pass(u64 pattern, u64 start, u64 end) |
74 | { | |
75 | u64 size = 0; | |
76 | ||
77 | while (start < end) { | |
78 | start = find_e820_area_size(start, &size, 1); | |
79 | ||
80 | /* done ? */ | |
81 | if (start >= end) | |
82 | break; | |
83 | if (start + size > end) | |
84 | size = end - start; | |
85 | ||
86 | printk(KERN_INFO " %010llx - %010llx pattern %016llx\n", | |
87 | (unsigned long long) start, | |
88 | (unsigned long long) start + size, | |
89 | (unsigned long long) cpu_to_be64(pattern)); | |
90 | memtest(pattern, start, size); | |
91 | ||
92 | start += size; | |
93 | } | |
94 | } | |
95 | ||
1f067167 YL |
96 | /* default is disabled */ |
97 | static int memtest_pattern __initdata; | |
98 | ||
99 | static int __init parse_memtest(char *arg) | |
100 | { | |
101 | if (arg) | |
102 | memtest_pattern = simple_strtoul(arg, NULL, 0); | |
d1a8e779 YL |
103 | else |
104 | memtest_pattern = ARRAY_SIZE(patterns); | |
105 | ||
1f067167 YL |
106 | return 0; |
107 | } | |
108 | ||
109 | early_param("memtest", parse_memtest); | |
110 | ||
111 | void __init early_memtest(unsigned long start, unsigned long end) | |
112 | { | |
6d74171b | 113 | unsigned int i; |
bfb4dc0d | 114 | unsigned int idx = 0; |
1f067167 YL |
115 | |
116 | if (!memtest_pattern) | |
117 | return; | |
118 | ||
570c9e69 | 119 | printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern); |
6d74171b | 120 | for (i = 0; i < memtest_pattern; i++) { |
bfb4dc0d AH |
121 | idx = i % ARRAY_SIZE(patterns); |
122 | do_one_pass(patterns[idx], start, end); | |
123 | } | |
124 | ||
125 | if (idx > 0) { | |
126 | printk(KERN_INFO "early_memtest: wipe out " | |
127 | "test pattern from memory\n"); | |
128 | /* additional test with pattern 0 will do this */ | |
129 | do_one_pass(0, start, end); | |
1f067167 | 130 | } |
1f067167 | 131 | } |